[Equest-users] Baseline system selection for combination of DES and electrict

[Nicholas Caton]

Hi Milan,

For more constructive responses, you might want to provide further description of what you mean by "baseline system selection."  Is this for a specific energy standard or version of LEED, or something else for compliance modeling?  Are you exploring new construction or renovation options outside the constraints of something like LEED or an energy standard?  Each of these scenarios might provoke different advice for baseline system type decisions.

In my experience with the likes of LEED reviews, I have more than once run into circumstances where building heating source or other factors appear to make more than one 90.1 baseline system type "correct" for the same spatial areas of the building (i.e. furnace preheat, electric coil reheat for a VAVS system).  In those scenarios, I've been deliberate in my initial submission to generate extra documentation to clearly present the conundrum in application of the standard, and to make the case for why I elected to choose one type over another - typically demonstrating and illustrating for example something like "the majority (XX%) of airstream heating over the year is shown to be via combustion heating sources relative to electric heating sources." I've never had a LEED reviewer reject a clearly made case under those circumstances.

There also exists the option to use more than one baseline system type where that makes the most sense.  There are for example in 90.1 exceptions to the "one system per floor" rule that define circumstances under which you may (or must - depends on your interpretation) define additional system types.
For what it's worth, I *personally* interpret these rules and corresponding exceptions for the quantity and variety of baseline system types as a series of guidelines to judge what's appropriate, and aren't to be taken too rigidly/literally (i.e. don't get hung up over whether a very different system covers a specific square footage when it also covers nearly half the building - there's an obvious case there for >1 system type).  I know others like to interpret this language very rigidly however, and respect that position if that helps you sort out applying the standard.

~Nick

[cid:image001.png at 01D36A87.281461F0]
Nick Caton, P.E., BEMP
  Senior Energy Engineer
  Regional Energy Engineering Manager
  Energy and Sustainability Services
  Schneider Electric

D  913.564.6361
M  785.410.3317
F  913.564.6380
E  nicholas.caton at schneider-electric.com<mailto:nicholas.caton at schneider-electric.com>

15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
United States

[cid:image002.png at 01D36A87.281461F0]



From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Milan Janak via Equest-users
Sent: Friday, December 01, 2017 6:18 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Baseline system selection for combination of DES and electrict

Dear All,

We would like to ask for an advice related to the Baseline System selection for:


  1.  Office building with 8 floor and 12865m2 area
  2.  VRV electric cooling
  3.  VRV electric heating
  4.  District heating for Air Handling Units

Best regards,


Ing. Milan Janák, PhD                                            Simulácie Budov, s.r.o.
BREEAM AP                                                              Čajakova 13
BREEAM Assessor                                                   81105 Bratislava
Member ASHRAE, CIBSE, SKGBC                          Slovakia
www.simulaciebudov.sk<http://www.simulaciebudov.sk>                                       GSM: +421(0)903776610


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